With the 20% tint in the rear I've been having some difficulties seeing at night so I decided to replace the stock reverse lights with some LED ones.
I've already tested these at night and there is a significant difference in brightness.
You can buy it here, they 6500K Xenon White LED Bulbs.
http://www.amazon.com/gp/product/B008G4Y076/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1
How to replace your rear bulbs.
http://www.fiestastforum.com/forum/threads/455-How-To-Fiesta-ST-Rear-Tail-Light-Bulb-Replacement
I've already tested these at night and there is a significant difference in brightness.
You can buy it here, they 6500K Xenon White LED Bulbs.
http://www.amazon.com/gp/product/B008G4Y076/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1
How to replace your rear bulbs.
http://www.fiestastforum.com/forum/threads/455-How-To-Fiesta-ST-Rear-Tail-Light-Bulb-Replacement